Improvement in valve-indicators



J. S. WALLACE.

VALVE-INDICATOR.

Patented 13120.14, 1875.

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ATTORNEYS.

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"PETERS, PHOTO-LITHOGRIWHER. WASHINGTON. D. C

UNITED STATES PATIENT OFFIOE' JOHN S. WALLACE, OF BRETTLAND, OHIO.

IMPROVEMENT IN VALVE-INDICATORS.

Specification forming part of Letters Patent N0. l7l,071, dated December14, 1875; application filed November 6, 1875.

To all whom it may concern:

Be it known that 1, JOHN SHAW WALLACE, of Brettland, in the county ofAthens and State of Ohio, have invented a new and ImprovedValve-Indicator, of which the following is a specification My inventionconsists of a stem connected to the valve and projecting out through oneend of the steam-chest, and carrying a pointer along an indicator-scale,by which to set the valve without opening the steam-chest.

Figure 1 is a side elevation, and Fig. 2 is a front elevation, of myimproved valve-indicater.

Similar letters of reference indicate corresponding parts.

A is a rod or stem, connected to the valve, and extending out through astutfing-box, B,

and carrying a pointer, D, along an indicatorscale, 0, by which thevalve may be set at any time without opening the chest, which always hasto be done as at present arranged. The indicator also shows when thevalve works out of position by the shifting of an eccentric, or fails towork full stroke in case of any slack by wear in the valve-gear.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The combination of the sliding rod A, pointer D, andindicator-scale G with a slidevalve, as and for the purpose set forth.

JOHN SHAW WALLACE.

Witnesses:

RICHARD JAY STOUT, WILLIAM G. HALBERT.

